Chuck for planing-machines.



G. L. DEGKARD.

CHUCK FOR PLANING MACHINES.

APPLICATION FILED PEB.27, 1912. 1,071 ,21 5. Patented Aug". 26, 1913.

Skim/um CHARLES L. DECKARD, OF PITTSBURG, KANSAS.

CHUCK FOR PLANINGr-MACHINES.

Specification of Letters Patent.

Patented Aug. 26,1913.

Application filed February 27, 1912. Serial No. 680,200.

To all whom it may concern.

Be it known that I, CHARLES L. DnoKAm), citizen of the United States, residing at Pittsburg, in the county of Crawford and State of Kansas have inventedcertain new and useful Improvements in Chucks for Planing-Machines, of which the following is a specification.

This invention is a chuck for planing machines and has special reference to machines employed for planing the castings for locomotive shoes or wedges, the object of the invention being to provide a simple and efficient device by which the casting will be firmly held while being dressed and which may be nicely adjusted to hold the casting in position to secure the desired finish to the planed surface.

A further object of the invention is to provide means whereby the holding parts will be prevented from slipping when the chuck is in use, and the invention seeks further to improve the construction and arrangement of the parts generally whereby to increase the durability and efficiency of the device.

In the annexed drawings, which fully illustrate the invention: Figure 1 is a perspective View of a chuck provided with my improvements; Fig. 2 is a sectional view taken longitudinally through the adjusting jaws; Fig. 3 is a transverse section of the chuck; Fig. 4 is an enlarged detail sectional view of the means for adjusting the jaws and holding them in the adjusted position.

The body of the chuck consists of a central block 1 having offsets 2 at its ends and provided with perforated lugs or ears 3 through which securing screws or bolts may be inserted to secure the device upon the bed of the planing machine. Upon the upper sides of the offsets 2 I provide the ribs or retaining walls 4, three of which form continuations of the sides of the offsets and across the offset adjacent the central block 1 and connecting the side ribs or walls, as

clearly shown. Grooves 5 are formed across the ends of the main bar or body 1 in the upper surface thereof and extend into the offsets 2, as will be readily understood, a

double wedge 6 being secured'in or formed upon the base of each groove, as will be readily understood upon reference to Fig. 2. The jaws 7 are slidably mounted upon.

the inclined faces of the wedge G and are of a tapered formation to conform to the wedge and maintain their upper surfaces 8 in horizontal planes. Each jaw extends through an opening in the inner side wall or rib 9 of the adjacent offset, and springs 10 are arranged in the top of each opening .to bear upon the upper surface of the jaw passing therethrough so as to hold the jaw close to the wedge and thereby prevent the cuttings or filings passing into the groove so as to choke the same and prevent the adjustment of the jaw. Each jaw is provided at its outer end with an upstanding lug 11 through which passes an adjusting screw 12 having a threaded engagement with the lug and having its inner end journaled in the rib or wall 9, as shown in Fig. 2 and as will be readily understood. The adjusting screw 12 is, of course, arranged parallel with the inclined face of the Wedge so that there will be no binding of the parts as the jaw is adjusted longitudinally of the wedge and thereby tends to move vertically. The outer end of the adjust-ing screw projects beyond the outer wall of the offset 2 and is provided with an angular extremity 13 which may be engaged by a wrench or other tool to effect rotation of the screw and con sequent adjustmentof the jaw. The outer face of the offset is preferably inclined or slightly overhung, as shown at 14, whereby opening, as will be readily understood. The

bore of this bushing is smooth so that there will be no tendency of the screw to move therethrough but the bushing is of such dimensions as to support the screw and form a bearing for the same. The bushing may be readily adjusted so as to compensate for wear of the screw and thereby prevent end play. A set screw 16 is mounted in the offsetdirectly over the bushing and is turned home against the bushing so as to hold it in position after it has once been adjusted.

The inner wall or rib of the offset is provided with threaded openings 17 near the opposite sides of the offset, and in one of the said openings I mount a set screw 18 at the end of which is a holding pin 19, to effect engagement with the casting 20, as shown.

The use of my device will, it is thought, be readily understood.

The chuck is secured upon the body of the planing machine and the casting indicated at 20, is placed upon the central body 1 of the chuck and is clamped in position thereon by the set screws 18 and pins 19, as shown. If the bottom of the casting be perfectly smooth and fiat the upper surface of the casting will be substantially parallel with the bed plate of the planing machine so that a cutter moved over the upper surface of the casting will shave the same and leave a cut surface parallel with the plane of the bed plate. The bottom of the casting, however, is seldom perfectly smooth and parallel with the top thereof and when it is laid off or trammed on the engine, pop marks 21 are made on its sides to indicate the depth of the cut to be made. The objectof the workman is to get the top surface of the shoe parallel with these marks. By operating the adjusting screws 12 the workman may quickly move the aws 7 in or out so that the several corners of the casting may be separately raised or lowered until all the marks are at the same height above the bed plate as tested by a surface gage so that a cut parallel with the plane of the said marks will be assured. The screws and pins 18 and 19 serve to hold the casting down upon the chuck and prevent it rising therefrom or tilting during the operation of the planing machine, and a rib or stop 22 is formed along one end of the chuck between the offsets 2 to prevent the shoe being forced off the chuck by the action of the planing knife. The casting is preferably provided near each end in its opposite sides with a series of small recesses or sockets 23 to receive the ends of the holding pins 19, and if the pop marks 21 should be so located as to be too near the end of the shoe and tend to interfere with the setting up of the work, the said holding pins and the corresponding screws may be withdrawn from the openings 17 in which they are mounted and transferred to the other openings in the same offset.

My improved chuck will remain rigid on the bed plate of the machine and will hold the work rigidly while the planing operation is being performed so that the workman is not required to reset his work before the finishing cut is taken.

The device is exceeding durable and possible end play of the adjusting screws is amply provided for by the provision of the bushing in which the outer ends of the said screws are mounted. 7

The device is composed of few parts which are of very simple construct-ion so that the cost of production and installation is reduced to a minimum and the time and labor required to operate it is practically of no consequence.

Having thus described my invention, what is claimed is:

1. A chuck for planing machines comprising a body, jaws at both ends of the body movable transversely of the same and adapted to support the work, means above the body for holding the work upon the jaws, means upon the body for moving the jaws transversely thereto, and means for causing the jaws to assume a higher or a lower level during their transverse movement.

2. In a chuck for planing machines, the combination of a body having offsets at its ends, means at the ends of the body to support and adjust the work, and holding devices mounted in the offsets adapted to engage the work.

3. In a chuck for planing machines, the combination of a body, transversely movable wedge-shaped work-supporting jaws at the ends of the body having upstandinglugs at their outer ends, and adjusting screws having their ends journaled in fixed bearings upon the body at opposite sides of said lugs and their intermediate portions passing through and engaging said lugs.

4. In a chuck for planing machines, the combination of a body having lateral offsets at its ends and provided with transverse grooves extending into said offsets, said grooves having inclined bottom surfaces in the bottom of said grooves converging toward the medial line of the body, tapered jaws resting on and slidable upon the said inclined surfaces, and adjusting screws mounted in the offsets andengaging the said jaws and disposed parallel with the said inclined surfaces.

5. In a chuck for planing machines, the combination of a body, transversely movable wedge-shaped work-supporting aws at the ends of the body, adjusting devices mounted on the body and engaging the ends of the jaws, and means on the body above the jaws for holding the same to their seats.

6. In a chuck for planing machines, the combination of a body having transverse grooves at its ends and inclined surfaces in the bottoms of said grooves, work-supporting jaws slidably mounted in the grooves and fitted to said inclined surfaces, means for adjusting the jaws, and coiled springs bearing upon the upper sides of the jaws to hold them to the said inclined surfaces.

7. In a chuck for planing machines, the combination of a body having lateral offsets at its ends and provided with upstanding walls around said ofisets, work-supporting jaws movable upon the body and said offsets, adjusting screws having their inner ends ournaled in the inner upstanding walls of the offsets, and having their intermediate portions engaging the jaws, bushings threaded into the outer walls of the offsets and supporting the outer ends of said screws, and set screws mounted in said walls and bearing upon the circumferences of said bushings.

8. In a chuck for planing machines, the combination of a body having a stop at one end, transversely disposed jaws at the ends and on opposite sides of the body, means for adjusting said j aws independentL and means above the said jaws for holdlng the work thereto.

In testimony whereof I affix my signature in presence of two witnesses.

CHARLES L. DEGKARD. [L.s.]

Witnesses:

M. T. ALLEN, SI-IREVE SHINN.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. G. 

